I'm going to go ahead and say that I will likely never be able to do this all by myself. The sheer amount of shit we have on the station makes any attempt at getting close to that by myself basically impossible. There's an absolute metric ton of stuff I have to make, even if only in the scenery department. Actual functioning lava, heat, and atmosphere related machines are a whole other mess that I'd like you guys to help contribute to.
To give you a sense of what this lava world looks like, I've gone ahead and sprited some basic parts and assembled them. Note that this will not reflect how it looks, as it's missing many effects:

I plan on adding large destructible rocks like those little jagged ones on the ground you see (but that actually obstruct movement and maybe vision) as well as fissures, a constant ember/ash snowfall effect, maybe even lightning effects with the screen flashing. Finally, I also need to add various hostile lifeforms since the sprites we have for the asteroid monsters just don't fit here and are frankly too poorly sprited to consider using.
Also note that the lighting will not be as bright as in this picture. Lava is animated and will provide a natural source of light, but otherwise the world will be fairly gloomy (though not pitch black).
I'm also hoping to get help in the sound department. Let's hope cuboos feels up to the task. If he doesn't want to, then I can only hope we can either find some really good generic sounds on the internet or have someone else who knows how to do sound editing volunteer.
If you want to contribute, here's the link to the sprites.